Playboy founder Hugh Hefner's ex-girlfriend Holly Madison and her reality show costar are making no secret of their low opinion of Hef's new fiancée, Crystal Harris.
Madison, 31, has been reluctant to speak about Harris, but when pressed by PEOPLE, her on-camera sidekick Josh Strickland said, "We don't really know her that well, but the few times we've seen her, it's been a cold shoulder. We really haven't done anything to her."
Madison then jumped in, saying Harris's true colors can be seen in an un-aired scene. "They really need to show that birthday footage," Madison says after mentioning that Hef's gal, 24, appears in an episode of her show "for a second."
"Crystal called us clowns in a circus," adds Strickland of the alleged tape. "It's just kind of like, 'Who the hell are you?' "
But Harris's camp denies any animosity.
"Crystal has always been extremely friendly to Holly, and if that wasn't the case, then Holly wouldn't be continuing to return to the mansion," Harris's manager Michael Blakey tells PEOPLE. "She doesn't understand why Holly and Josh would make these allegations. She has no ill feelings toward Holly at all. Crystal believes this is a misunderstanding. I know her very well, and I've never heard her say an unkind word about anyone."
As for Hefner, 84, Madison's thoughts about his engagement – which will play out in the second episode of her show this season – are complicated.
"I don't really feel just one way about it," says Madison, who is also the star of the Vegas show Peepshow and the face of AMIClubWear clothing line. "It's not really something that's easy for me to sum up, so I need to get all the layers of my feelings out. I just wanted to see Hef and go up and talk to him about it. There's definitely a lot of pressure. People expect me to feel a certain way."
Season two of Holly's World premieres Jan. 23 on E!